<!DOCTYPE html>
<html lang="zh">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        /* header---头部标签 */
        /* nav---导航栏标签 */
        /* article---侧边栏标签 */
        /* section---某个区域 */
        /* footer---尾部标签*/
        header {
            height: 120px;
            width: 800px;
            background-color: pink;
            border-radius: 15px;
            margin: 15px auto;
            text-align: center;
            line-height: 120px;
        }
        nav {
            width: 800px;
            height: 120px;
            background-color: chartreuse;
            border-radius: 15px;
            margin: 15px auto;
            text-align: center;
            line-height: 120px; 
        }
        article {
            display: inline-block;
            width: 350px;
            height: 500px;
            background-color: red;
            border-radius: 15px;
            margin: 15px 150px;
            text-align: center;
            line-height: 500px;
        }
        section {
            width: 90px;
            height: 170px;
            background-color: darkblue;
            border-radius: 15px;
            margin: 15px 150px;
            text-align: center;
            line-height: 170px;
        }
        footer {
            width: 800px;
            height: 120px;
            background-color: greenyellow;
            border-radius: 15px;
            margin: 15px auto;
            text-align: center;
            line-height: 120px;
        }
    </style>
</head>
<body>
    <header>头部标签</header>
    <nav>导航栏标签</nav>
    <article>侧边栏标签</article>
    <article>侧边栏标签</article>
    <section>某个区域</section>
    <footer>尾部标签</footer>
    
    
</body>
</html>